Sometimes when you're working with someone, you see a project start to go a bit wrong. Maybe it's not proceeding as quickly as it should, or maybe it's someone trying something new. As a manager, how do you know when to step in?
This is the heuristic I use:
It's pretty simple: if they're going to be publicly embarrassed, if they're never going to finish, or if it can't be fixed, speak up. Otherwise, keep your mouth shut and let the person doing the project learn.